ktvu's maureen naylor in san bruno with late details. maureen. >> reporter: kents official death count stands at four people with four others still missing. crews are still on the scene. this road remains blocked this hour and the ntsb says it could be another day were to before it completes its onsite investigation and since pg&e started to hand over its first documents today. this family walked into think san bruno foam home for the first time in three days and found their dinner from thursday night still on the counter. >> we left the food here, because we we are ready to eat at time when we heard the big boom, booming boom. >> reporter: what caused that gas line explosion last thursday remains under investigation. >> if we find any indication that this is a systematic problem through the system as opposed to local, right here, we will indicate that and recommend accordingly. >> reporter: the ntsb removed this 28-feet section of pipe, which was thrown 150 feet from underground. tonight its sending the piece to a washington, d.c. lab t